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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8da857d8458f94e594bdf31657f615a968d0a7be002845e747473f38c4d1739e' 
  AND token = '7Q137qMfr6bI4hS+2uxo4gJAn9T87fDFK+lQoCqSPNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}